66 lines
1.5 KiB
JavaScript
66 lines
1.5 KiB
JavaScript
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'use strict';
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var jsTokens = require('js-tokens');
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var processEnvRe = /\bprocess\.env\.[_$a-zA-Z][$\w]+\b/;
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var spaceOrCommentRe = /^(?:\s|\/[/*])/;
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function replace(src, envs) {
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if (!processEnvRe.test(src)) {
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return src;
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}
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var out = [];
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var purge = envs.some(function(env) {
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return env._ && env._.indexOf('purge') !== -1;
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});
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jsTokens.lastIndex = 0
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var parts = src.match(jsTokens);
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for (var i = 0; i < parts.length; i++) {
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if (parts[i ] === 'process' &&
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parts[i + 1] === '.' &&
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parts[i + 2] === 'env' &&
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parts[i + 3] === '.') {
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var prevCodeToken = getAdjacentCodeToken(-1, parts, i);
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var nextCodeToken = getAdjacentCodeToken(1, parts, i + 4);
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var replacement = getReplacementString(envs, parts[i + 4], purge);
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if (prevCodeToken !== '.' &&
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nextCodeToken !== '.' &&
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nextCodeToken !== '=' &&
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typeof replacement === 'string') {
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out.push(replacement);
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i += 4;
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continue;
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}
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}
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out.push(parts[i]);
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}
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return out.join('');
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}
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function getAdjacentCodeToken(dir, parts, i) {
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while (true) {
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var part = parts[i += dir];
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if (!spaceOrCommentRe.test(part)) {
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return part;
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}
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}
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}
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function getReplacementString(envs, name, purge) {
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for (var j = 0; j < envs.length; j++) {
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var env = envs[j];
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if (typeof env[name] !== 'undefined') {
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return JSON.stringify(env[name]);
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}
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}
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if (purge) {
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return 'undefined';
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}
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}
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module.exports = replace;
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